Good on you!
I had been thinking of splitting a pair of the soft ProGrip superbike grips I like lengthwise & saftey wiring them on . . . I'd never have thought you could stretch them enough to get them over the outside in one piece. This is excelent, I'm off to buy another set!
Something else that recommends this idea over grip pups or neoprene is that the soft rubber diamond pattern grip surface is much tackier, and alows for a secure grip on the bars with less force exerted by your hand. Spongier grips can actually lead riders to grip harder, subconciously searching for a feeling of control. This was studied back in the late 70s/early eighties with respect to road racing bicycles, and is the reason foam grips came and went as a fad in that sport.